Design a large-scale Notification Platform
Last updated: May 30, 2026
Quick Overview
Design a high-throughput notification system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Notion
May 30, 2026103
6
2,827 solved
Design a high-throughput notification system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This fundamentals question from Notion's System Design Round tests whether you can reason about software design at a deep level. The interviewer expects discussion of maintainability, testability, and operational considerations.
What the Interviewer Expects
- Explain the concept clearly with a practical example
- Discuss when and why to apply this principle
- Identify common mistakes and anti-patterns
- Compare with alternative approaches
Key Topics to Cover
How to Approach This
- Apply SOLID principles. Single Responsibility makes code testable, Open/Closed makes it extensible.
- Choose data structures based on access patterns, not familiarity.
- Prefer immutable data and message passing over shared mutable state for concurrency.
- Design APIs with RESTful conventions, versioning, meaningful errors, and pagination from day one.
Possible Follow-up Questions
- How would this design change if the team size doubled?
- What testing strategy would you use for this component?
- How would you document this for other engineers?
- What are the security implications of this design?
Practice a Similar Problem on Codemia
Solve a related problem with our interactive workspace, get AI feedback, and view detailed solutions.
Solve on CodemiaSample Answer
Core Design Principles
For designing a high-throughput notification platform at Notion, the key design principles are:
- Scalability: The system must efficiently handle millions of concurrent notifications without deg...
Architecture
The architecture for Notion's notification system would follow a Microservices approach:
- Notification Service: This microservice will be responsible for generating notifications based on u...
Submit Your Answer
